• 2022-06-01
    选择下列函数运行后的输出s=fg[2x]+fg[2y z]+fg[4z]/.fg[2x_]-> fg[x+2]+fg[x]
    A: fg[x]+fg[2+x]+fg[4z]+fg[2y z]
    B: fg[2x]+fg[4z]+fg[y z]+fg[2+y z]
    C: fg[x]+fg[2+x]+fg[4 z]+fg[y z]+fg[2+y z]
    D: fg[x]+fg[2+x]+fg[2z]+fg[2z+2]+fg[2y z]